[Sane-analysis] Minutes of October 12 Analysis Meeting

[Narbe Kalantarians]

_*Narbe:*_ Looking further at BETA dilution factors. After the previous 
iteration it was noticed that the parallel and perp B-field df's were 
considerably different. Compared rates for 2 4.7 GeV runs, one parallel 
and one per B-field, with similar packing fractions. Need to cut out 
edges. Still, there are the jumps, which might be statistical 
.https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Kinematics#10.2F05.2F2011

*After this meeting, found that Q^2 bins/cuts weren't being applied 
correctly. This makes the df's for the 2 runs look more like each other. 
Applied cuts for edges as well, but these didn't seem to have quite the 
same effect as getting the Q^2 bin-cuts correct.


_*Anusha:*_ Comparing MC for B-field being on and off. With B-field, 
sees a correlation (xptar_recon - xptar_initial) vs zbeam_initial. 
Modified initial coordinates xs, ys, and zs to use as they get called 
instead of projecting back to zs=0 and using the new xs,ys and zs at 
zs=0. This got rid of the correlation. Compared data/MC. Seems to work 
very well for Carbon target, not quite as well for NH3. There are some 
explanations for this, though, the main one being that the packing 
fractions aren't correct yet.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/Find_srast_x/y_offsets#Modified_MC_and_Updated_srast_x.2Fy_offsets_10.2F12.2F2011


_*Hovhannes:*_ Comparing (pol. radiation corrected) asymmetries and spin 
structure functions to models (LSS06, CLAS, AAC). The AAC model seems to 
be most like the SANE data.
https://hallcweb.jlab.org/experiments/sane/bhovik/int_RAD/
Will try chi-square test for discerning the models, as well as 
bin-centering.


_*Jon:*_ Comparing (x_Bjorken and Q^2) bin centers for parallel and perp 
B-field data. Overall, the bins seem to mostly overlap. The details are 
explained in his link. This is for understanding how to combine the data 
for the physics asymmetries A_1,2.
https://hallcweb.jlab.org/experiments/sane/wiki/index.php/JrmCoefficients
Will look at A_90 to check for any (azimuthal)phi dependence.

As always, please let me know if I missed anything or if I made any 
mistake(s).

Next meeting will be October 19th, 3:30 pm (JLab time).


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